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Title: Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction

Abstract

The influence of baroclinic vorticity production on the unsteady drag coefficient in shock–particle interaction is numerically studied in this work. Numerical simulations are performed for shock–particle interaction utilizing a high–resolution axisymmetric solver for the Euler equations that allows for multi-material interface and shock propagation in both the particle and surrounding medium. We consider an aluminum particle in nitromethane and allow for particle deformation. We compute the vorticity production and unsteady drag coefficient as a function of time to explain the complex physical mechanisms that occur during shock–particle interaction. We observe baroclinic vorticity production as the shock propagates over the particle and find that the vorticity is primarily generated at the surface of the particle. After the passage of the shock over the particle, the generated vortex traverses downstream, thus creating a sharpened particle edge and low pressure on the downstream side of the particle, followed by the trapping of the vortex at the particle edge. These mechanisms lead to the generation of a quasi-steady drag force even after the passage of the shock, thus suggesting the importance of baroclinic vorticity production to the unsteady drag coefficient. Finally, we compute the unsteady drag coefficient for various shock Mach numbers and particlemore » ellipticities.« less

Authors:
 [1];  [1];  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1614518
Grant/Contract Number:  
NA0002378; HDTRA1-14-1-0028
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 8; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Fluid drag; Particle physics; Multiphase flows; Vortex dynamics; Shock waves

Citation Formats

Fujisawa, K., Jackson, T. L., and Balachandar, S. Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction. United States: N. p., 2019. Web. doi:10.1063/1.5055002.
Fujisawa, K., Jackson, T. L., & Balachandar, S. Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction. United States. https://doi.org/10.1063/1.5055002
Fujisawa, K., Jackson, T. L., and Balachandar, S. Fri . "Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction". United States. https://doi.org/10.1063/1.5055002. https://www.osti.gov/servlets/purl/1614518.
@article{osti_1614518,
title = {Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction},
author = {Fujisawa, K. and Jackson, T. L. and Balachandar, S.},
abstractNote = {The influence of baroclinic vorticity production on the unsteady drag coefficient in shock–particle interaction is numerically studied in this work. Numerical simulations are performed for shock–particle interaction utilizing a high–resolution axisymmetric solver for the Euler equations that allows for multi-material interface and shock propagation in both the particle and surrounding medium. We consider an aluminum particle in nitromethane and allow for particle deformation. We compute the vorticity production and unsteady drag coefficient as a function of time to explain the complex physical mechanisms that occur during shock–particle interaction. We observe baroclinic vorticity production as the shock propagates over the particle and find that the vorticity is primarily generated at the surface of the particle. After the passage of the shock over the particle, the generated vortex traverses downstream, thus creating a sharpened particle edge and low pressure on the downstream side of the particle, followed by the trapping of the vortex at the particle edge. These mechanisms lead to the generation of a quasi-steady drag force even after the passage of the shock, thus suggesting the importance of baroclinic vorticity production to the unsteady drag coefficient. Finally, we compute the unsteady drag coefficient for various shock Mach numbers and particle ellipticities.},
doi = {10.1063/1.5055002},
journal = {Journal of Applied Physics},
number = 8,
volume = 125,
place = {United States},
year = {Fri Feb 22 00:00:00 EST 2019},
month = {Fri Feb 22 00:00:00 EST 2019}
}

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